engine life span

My uncle runs a taxi service, and those engines are beaten good. They have the 4.6 like yours and are good until 500,000km because my uncle gets the taxi's in for oil changes every 5,000km's. He gave me one to rebuild for fun, and the engine after 500,000km's had almost no where, but the valves failed to seal.
 
Axhammer said:
My uncle runs a taxi service, and those engines are beaten good. They have the 4.6 like yours and are good until 500,000km because my uncle gets the taxi's in for oil changes every 5,000km's. He gave me one to rebuild for fun, and the engine after 500,000km's had almost no where, but the valves failed to seal.
I think 500,000 km equals 2 billion american miles. :D